反饋； 回授,自旋撓癢法
Stop tickling me, you beast! 別胳肢我了，你這討厭鬼！
Tomato plants need tickling to initiate pollination.In recent years British growers have been using bumblebees to do this. 西紅柿授粉要用回授技術(shù)，英國(guó)人近年來(lái)是用大黃蜂完成授粉。
